HP 7090A Operator's Manual page 62

Prepare the
Recording Area
lire
Select
:... ""'"
.
Trigger Mode
"
,--
.
"
IlIitiate the
Trigger Search
Recording
Completed
4·2
Performing Direct and Buffered Recordings
2. Prepare an appropriate recording area as follows. (Refer to Chapter 3 for
details.)
a. Position ZERO and FULL SCALE.
b. Set RANGE and OFFSET for the selected Y·axis channel.
c.
Set TOTAL TIME to scale the X-axis.
d. Grid the recording area.
For direct, versus-time recordings, TOTAL TIME determines the pen sweep
time. Times settings of
of less than
1 second and perform a l-second recording when the direct recording is
initiated.
3. Select a pen color appropriate for plotting the selected channel using the
PEN SELECT push buttons.
4. Use the TRIGGER mode selector to select the desired trigger mode.
,-,- For manual, front·panel triggering, select the MANUAL mode. (The
manual trigger mode is automatically selected during initialization.)
The external or internal trigger modes may also be selected for direct
recordings, as well as post·trigger time delays. These trigger modes and
operations are described in Chapter
5. Press RECORD DIRECT to initiate the trigger search.
The pen will move to the recording area's zero point. The pen remains in
the up position until the selected trigger is received, at which time the
pen lowers to draw the trace.
There is no trigger search for the manual trigger mode - pressing
RECORD DIRECT triggers the recording immediately (unless a post·trigger
time delay is specified).
For the external and internal trigger modes, the pen is lowered and
plotting begins when the selected trigger is received (unless a post-trigger
time delay is specified).
Status of the trigger search is shown by the TRIGGER SEARCH indicator,
which is continuously lit during a trigger search and blinks during a
post-trigger time delay.
The pen is automatically lifted when the recording is completed. Direct
recordings can be stopped in progress by pressing STOP
the-pen and terminate the recording.
Scans by ArtekMedia © 2007
1
second to 24 hours may be used. If a total time
1
second is selected, the
5.
HP 7090
will reset TOTAL TIME to
- this will lift